I had both an Amiga and PC in those days and I can tell you that the PC didn't become AT ALL interesting to me until Wolf3D. Before then I would use my PC for work (writing database apps) and my Amiga 500 for everything fun. And yes, in the USA most of us just had the A500 + 1084 setups. And it seemed like once I started gaming on the PC, the upgrade cycle was very short (6-8 months). I can't even remember how many graphics card, motherboard, CPU and hard drive upgrades I did in the 90s. Commodore definitely missed the boat by not releasing a more impressive machine during that small window of time.
Just my 2 cents.